tree f33f25b686df96893327428b3db44e24e4e3e901
parent 7d0797babe691ebe185ea6b89801d65b265d953a
author Marcel van Lohuizen <mpvl@golang.org> 1549813733 +0100
committer Marcel van Lohuizen <mpvl@golang.org> 1549813733 +0100

doc/ref: introduce regular expression syntax

This is one sorely missing feature of a data constraint
language. Now we have unary constraints, the
syntax and semantics for it naturally arises.

Also fixed a comment about the role of null.

Fixes cuelang/cue#12.

Change-Id: I921e39bb5d8dda667f7b9ad7c79a126411853da6